linux-kernel - Re: [PATCH 1/3] HWPOISON, hugetlbfs: fix warning on freeing hwpoisoned hugepage

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Message-Id: <20121206182024.5f3b47be.akpm@linux-foundation.org>
Date:	Thu, 6 Dec 2012 18:20:24 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andi Kleen <andi.kleen@...el.com>, Tony Luck <tony.luck@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] HWPOISON, hugetlbfs: fix warning on freeing
 hwpoisoned hugepage

On Thu,  6 Dec 2012 21:03:44 -0500 Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> This patch fixes the warning from __list_del_entry() which is triggered
> when a process tries to do free_huge_page() for a hwpoisoned hugepage.
> 
> ChangeLog v2:
>  - simply use list_del_init instead of introducing new hugepage list
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  mm/hugetlb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 59a0059..9308752 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3170,7 +3170,7 @@ int dequeue_hwpoisoned_huge_page(struct page *hpage)
>  
>  	spin_lock(&hugetlb_lock);
>  	if (is_hugepage_on_freelist(hpage)) {
> -		list_del(&hpage->lru);
> +		list_del_init(&hpage->lru);

Can we please have a code comment in here explaining why
list_del_init() is used?

>  		set_page_refcounted(hpage);
>  		h->free_huge_pages--;
>  		h->free_huge_pages_node[nid]--;
--
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